Machine learning-based prediction of cadmium bioaccumulation capacity and associated analysis of driving factors in tobacco grown in Zunyi City, China

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Zilun Gou , Chengshuai Liu , Meng Qi , Wenhao Zhao , Yi Sun , Yajing Qu , Jin Ma
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引用次数: 0

Abstract

Tobacco grown in areas with high-geochemical backgrounds exhibits considerably different cadmium (Cd) bioaccumulation abilities due to regional disparities and environmental changes. However, the impact of key factors on the Cd bioaccumulation ability of tobacco grown in the karst regions with high selenium (Se) geochemical backgrounds is unclear. Herein, 365 paired rhizospheric soil-grown tobacco samples and 321 topsoil samples were collected from typical karst tobacco-growing soil in southwestern China and analyzed for Cd and Se. XGBoost was used to predict and evaluate the Cd bioaccumulation ability of tobacco and potential influencing factors. Results showed that regional geochemical characteristics, such as soil Cd and Se contents, soil type, and lithology, have the highest influence on the Cd bioaccumulation ability of tobacco, accounting for 46.5% of the overall variation. Moreover, soil Se contents in high-geochemical background areas considerably affect Cd bioaccumulation in tobacco, with a threshold for the mutual suppression effects of Cd and Se at a soil Se content of 0.8 mg/kg. According to the results of bivariate local indicators of spatial association analysis, tobacco cultivated in the central, northeast, and southeast regions of Zunyi City carries a lower risk of soil Cd contamination. This study provides new insights for managing tobacco cultivation in karst regions.

基于机器学习的遵义市烟草镉生物累积能力预测及相关驱动因素分析
由于区域差异和环境变化,在高地球化学背景地区种植的烟草表现出截然不同的镉生物累积能力。然而,在高硒(Se)地球化学背景的喀斯特地区,关键因素对烟草镉生物累积能力的影响尚不清楚。本文从我国西南地区典型的喀斯特烟草生长土壤中采集了365个根际土壤生长烟草样品和321个表层土壤样品,并对其Cd和Se进行了分析。结果表明,土壤Cd和Se含量、土壤类型和岩性等区域地球化学特征对烟草Cd生物累积能力的影响最大,占总体变化的46.5%。此外,高地球化学背景区的土壤硒含量显著影响烟草中镉的生物累积,土壤硒含量为0.8mg/kg时,镉和硒的相互抑制作用阈值,遵义市东南部地区土壤Cd污染风险较低。本研究为岩溶地区烟草种植管理提供了新的思路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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